What size AC do I need for my home?

The right size depends on square footage, insulation, ceiling height, window area and orientation, and your home's specific exposure. A general rule of thumb suggests 20 BTU per square foot, but real sizing requires a Manual J load calculation. We perform a proper load calculation on every install rather than matching the new unit to the old one, which is a common cause of oversized systems that short-cycle and waste energy.

Is a heat pump more efficient than an air conditioner?

Not at cooling. A heat pump and an AC with the same SEER2 rating cool with identical efficiency. A heat pump is more efficient than the furnace or electric-resistance heater it replaces on the heating side, where it delivers two to four units of heat per unit of electricity.

Does a heat pump cost more than an air conditioner to run each month?

To cool, no, the monthly cost is the same. For heating, at Southern California's high electricity rates and relatively low gas prices, heat pump heating is roughly cost-comparable to a gas furnace on a monthly basis, even though it uses far less energy.

Can a heat pump replace my air conditioner?

Yes. A heat pump cools exactly like an air conditioner and uses the same ductwork, so it is a direct replacement for a central AC, with the bonus that it also heats.

Does a heat pump cool as well as an AC in Southern California summers?

Yes. In cooling mode they are the same machine. A correctly sized heat pump handles triple-digit valley afternoons just as well as a correctly sized air conditioner. What matters for comfort is proper sizing, not which of the two you choose.

How long does a heat pump last compared to an air conditioner?

Both typically last about 12 to 18 years in this climate with regular maintenance. A heat pump runs more hours because it also heats, but lifespan between the two is comparable. Sizing and maintenance affect longevity far more than machine type.

Is a heat pump worth it over a regular AC in California?

For most homes replacing both heating and cooling, yes, because one heat pump does both jobs efficiently. If only your AC failed and your furnace is newer, a standard AC can be the more economical choice. The right answer depends on your specific equipment and home.

Heat Pump vs AC in Southern California: Which Should You Install in 2026?

Reviewed by Russ Teaca, owner of Reliable Heating & Air — a licensed HVAC company (CSLB #1135270) serving Los Angeles & Ventura County since 2017. EPA Section 608 certified for A2L refrigerants.

If you are staring down a dying air conditioner and a quote that mentions both “AC” and “heat pump,” the first thing worth knowing is that these are not two completely different machines. In cooling mode, a heat pump and an air conditioner are essentially the same thing. The heat pump just does one extra job.

Heat Pump vs AC in Southern California: Which Should You Install in 2026?

Key Takeaways